A recording medium for storing virtual deletion information, and recording and/or reproducing method and apparatus therefor are provided. The recording medium includes a first region having a plurality of still pictures, and a second region having first virtual deletion information for the still pictures, and still picture group information for separating the still pictures in the first region into a predetermined maximum number of groups in order to manage the still pictures at a group level, wherein the first virtual deletion information is within the still picture group information, and if the first virtual deletion information is set to a virtual delete state, the corresponding still picture is not to be reproduced. Accordingly, file extent information can be prevented from excessively increasing by maximally preventing a recording area from being scattered, when some of a data file are deleted by a user's request.
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22. A method of reproducing at least one still picture from a recording medium having at least one still picture group information for arranging said at least one still picture into at least one group to manage said at least one still picture at a group level, said at least one still picture group information including virtual deletion information, of at least one flag, for said at least one still picture indicative of a virtual delete status for controlling reproduction of said at least one still picture upon playback of the recording medium, the method comprising:
reading a still picture group information, of said at least one still picture group information; and calculating a first position of a desired still picture in accordance with the read still picture group information and reproducing the still picture located at the calculated first position, and not reproducing the still picture at the calculated first position when a first virtual deletion information corresponding to the still picture at the calculated first position is set to a virtual delete state.
1. A method of recording and/or reproducing audio and/or video data on a recordable and/or rewriteable recording medium, the method comprising:
recording at least one still picture on a first region of the recording medium; recording at least one still picture group information, for arranging said at least one still picture into at least one group so as to manage said at least one still picture at a group level, on a second region of the recording medium; and recording at least one additional audio part for said at least one still picture on a third region of the recording medium, wherein said at least one still picture group information comprises still picture information for a corresponding still picture and information for connectivity between said at least one still picture and said at least one additional audio part, and the still picture information comprises first virtual deletion information for the corresponding still picture, wherein the corresponding still picture is not to be reproduced upon playback of the recording medium in response to the first virtual deletion information being set to a virtual delete state, with the first virtual deletion information being at least one flag.
2. The method according to
3. The method according to
4. The method according to
recording, in a separate area from still pictures, additional audio data added to corresponding still pictures after the corresponding still pictures are recorded; and recording additional audio group information having second virtual deletion information for virtually deleting the additional audio data corresponding to the still pictures having the first virtual deletion information set to a virtual delete state and information for separating the additional audio data into a predetermined maximum number of groups so as to manage the additional audio data at a group level, wherein the second virtual deletion information is within the additional audio data separating information, and recording information indicative of the additional audio data corresponding to the still pictures in said at least one still picture group information.
5. The method according to
6. The method according to
7. The method according to
8. The method according to
9. The method according to
10. The method according to
11. The method according to
12. The method according to
13. The method according to
reading a still picture group information, of said at least one still picture group information, to be reproduced in accordance with playback information; and calculating a first position of a desired still picture in accordance with the read still picture group information and reproducing the still picture located at the calculated first position, and not reproducing the still picture at the calculated first position if the still picture at the calculated first position has a corresponding first virtual deletion information contained in the read still picture group information set to a virtual delete state.
14. The method according to
recording original audio data consecutively after corresponding still pictures; and calculating a second position of the original audio data corresponding to the desired still picture in accordance with the read still picture group information and reproducing the original audio data located at the calculated second position, and not reproducing the original audio data corresponding to the desired still picture having the first virtual deletion information contained in the read still picture group information set to the virtual delete state.
15. The method according to
16. The method according to
17. The method according to
determining if all still pictures in a corresponding still picture group are set to the virtual delete state; and deleting all data in the corresponding still picture group and deleting the corresponding still picture group information if all the still pictures in the corresponding still picture group are set to the virtual delete state.
18. The method according to
recording additional audio data corresponding to still pictures and arranged into a member of additional audio data groups and recording additional audio group information having second virtual deletion information for the respective additional audio data indicative of a virtual delete state set by a user; and calculating a second position of the additional audio data for the corresponding desired still picture in accordance with the additional audio group information if there is information indicative of one of the additional audio groups in the read still picture group information and reproducing the additional audio data at the second position, and not reproducing the additional audio data at the second position having the second virtual deletion information corresponding to the desired still picture having the first virtual deletion information set to the virtual delete state, set to the virtual delete state.
19. The method according to
20. The method according to
determining if all additional audio data in a same one additional audio group are set to the virtual delete state; and deleting all data in the one additional audio group and deleting the corresponding additional audio group information if all the additional audio data in the one additional audio group are set to a virtual delete state.
21. The method according to
23. The method according to
calculating a second position of the original audio data corresponding to the desired still picture in accordance with the read still picture group information and reproducing the original audio data located at the calculated second position, and not reproducing the original audio data corresponding to the desired still picture having the first virtual deletion information contained in the read still picture group information set to the virtual delete state.
24. The method according to
25. The method according to
calculating a third position of the additional audio data for the corresponding desired still picture in accordance with the additional audio group information if there is information indicative of one of the additional audio groups in the read still picture group information and reproducing the additional audio data at the third position, and not reproducing the additional audio data at the third position having the second virtual deletion information corresponding to the desired still picture having the first virtual deletion information set to the virtual delete state, set to the virtual delete state.
26. The method according to
27. The method according to
determining if all additional audio data in a same one additional audio group are set to the virtual delete state; and deleting all data in the one additional audio group and deleting the corresponding additional audio group information if all the additional audio data in the one additional audio group are set to a virtual delete state.
28. The method according to
29. The method according to
30. The method according to
determining if all still pictures in a same one still picture group are set to the virtual delete state; and deleting all data in the one still picture group and deleting the corresponding still picture group information if all the still pictures in the one still picture group are set to the virtual delete state.
31. The method according to
calculating a second position of the additional audio data for the corresponding desired still picture in accordance with the additional audio group information if there is information indicative of one of the additional audio groups in the read still picture group information and reproducing the additional audio data at the second position, and not reproducing the additional audio data at the second position having the second virtual deletion information corresponding to the desired still picture having the first virtual deletion information set to the virtual delete state, set to the virtual delete state.
32. The method according to
33. The method according to
determining if all additional audio data in a same one additional audio group are set to the virtual delete state; and deleting all data in the one additional audio group and deleting the corresponding additional audio group information if all the additional audio data in the one additional audio group are set to a virtual delete state.
34. The method according to
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This application is a divisional of application No. 09/339,190, filed Jun. 24, 1999, now pending.
This application claims the benefit of Korean Application Nos. 98-23991, filed Jun. 24, 1998 and 98-44804, filed Oct. 26, 1998, in the Korean Patent Office, the disclosures of which are incorporated herein by reference.
1. Field of the Invention
The present invention relates to recording and/or reproducing information, for effectively processing a still picture, and more particularly, to a recording medium for storing virtual deletion information for preventing file extent information from excessively increasing when some of a data file is deleted by a user's request, and recording and/or reproducing method and apparatus therefor.
2. Description of the Related Art
First, terms used throughout the specification will now be described. Supposing a movie was recorded in first and second parts, the overall movie is a program chain (PGC) and the first and second parts are programs. Also, each program can be defined by further dividing the same into several cells called sub-units. The information in each cell can wholly or partially define a video object (VOB). In such an event, each cell is used as a basic accessing unit during reproduction, and the program and PGC are only the information for connectivity between a plurality of cells.
Also, since data is actually sub-divided into video object units (VOBUs) and recorded in a moving picture data file, the VOB information includes various kinds of information relating to the VOBU data, that is, VOBU #1, VOBU #2, . . . and the VOB data in the moving picture data file is accessed by the VOB information. Here, the VOB data is used as a random access unit of a disk recording/reproducing apparatus. The VOBU is based on a single GOP (Group of Pictures) in the case of an MPEG (Moving Picture Experts Group) video, and audio data corresponding to video data is collected, that is, A/V data is multiplexed into sectors, to constitute a VOBU.
The data format shown in
Generally, data errors may be generated if data is recorded on a recordable disk a predetermined number of times. Thus, there is a limit in the number of times for rewriting data on a disk. All information is stored in the memory of a controller for controlling the system for the purpose of limiting the number of recording times and rapidly accessing data. However, as described above, in the case of a still picture, if the amount of information is increased, much time is required for reading the information. Also, there is a limit to the amount of information that can be stored in a memory with a limited size. Accordingly, it is not possible to record a large-capacity still picture.
In a two-dimensional recording medium such as a disk, a file may be distributed in physically fragmented spaces to then be recorded, and information which connects the scattered areas is recorded in a file system as file extent information. File extent information is information for logically connecting a file having the scattered areas and generally represents the scattered areas sequentially as start positions and lengths of data. Referring to
In other words, as shown in
To solve the above problems, it is a first object of the present invention to provide a recording medium for grouping a plurality of large-capacity still pictures for the purpose of managing the same at a still picture group level, and for storing still picture group information containing information for virtually deleting a desired still picture.
It is a second object of the present invention to provide a recording medium for grouping a plurality of additional audio data other than original audio data added to still picture data, for the purpose of managing the same at an additional audio group level, and for storing additional audio group information containing information for virtually deleting additional audio data.
It is a third object of the present invention to provide a recording and/or reproducing method and apparatus for grouping a plurality of a large-capacity still pictures and incorporating virtual deletion information into the information managed at a still picture group level for the purpose of virtually deleting a desired still picture and original audio data corresponding thereto.
It is a fourth object of the present invention to provide a recording and/or reproducing method and apparatus for grouping a plurality of additional audio data relating to still pictures and incorporating virtual deletion information into the information managed at an additional audio group level for the purpose of virtually deleting the additional audio data corresponding to the virtually deleted still picture.
Additional objects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
To achieve the first object, there is provided a recording medium including a first region having a plurality of still pictures, and a second region having first virtual deletion information for the still pictures, and still picture group information for separating the still pictures in the first region into a predetermined maximum number of groups in order to manage the still pictures at a group level, wherein the first virtual deletion information is within the still picture group information, and if the first virtual deletion information is set to a virtual delete state, the corresponding still picture is not to be reproduced.
To achieve the second object, there is provided a method for recording and/or reproducing audio and/or video data on a recordable and/or rewriteable recording medium including (a) recording a plurality of input still pictures, and (b) separating the plurality of still pictures into a predetermined maximum number of groups, and recording still picture group information having first virtual deletion information for the respective still pictures set to a virtual delete state by a user and playback information related to reproduction.
Also, the method according to the invention further includes the steps of reading the still picture group data to be reproduced in accordance with the playback information, and calculating the position of a desired still picture in accordance with the read still picture group data and reproducing still picture data located at the calculated position, while not reproducing still picture data having the first virtual deletion information contained in the read still picture group data set to a virtual delete state.
The apparatus according to the present invention includes a recording processor for signal-processing a plurality of still pictures to be recorded in a first region of the recording medium, and a controller for controlling first virtual deletion information for still pictures set to a virtual delete state by a user, the first virtual deletion information contained within still picture group information for separating the still pictures in the first region into within a predetermined maximum number of groups in order to manage the still pictures at a group level, for generating playback information related to a reproduction order, and for controlling the generated playback information to be recorded in a second region of the recording medium.
According to another aspect of the invention, the apparatus further includes a playback processor for reproducing still picture data in the first region based on the still picture group information in the second region, while not reproducing still picture having the first virtual deletion information set to a virtual delete state.
The above objects and advantages of the present invention will become more apparent by describing in detail preferred embodiments thereof with reference to the attached drawings in which:
Hereinafter, preferred embodiments of recording media for storing virtual deletion information for a still picture, and a recording and/or reproducing method and apparatus therefor, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout. The embodiments are described below in order to explain the present invention by referring to the figures.
Here, PGC general information contains information such as the number of programs in a PGC. Program general information contains information such as the number of cells in a program. The cell information designates a VOB in the case of a moving picture, as shown in
A user may add separate additional audio data to a desired still picture after recording the still picture and original audio data on a still picture file 23. At this time, only the additional audio data are collected and recorded in a separate area in the additional audio data file 24 or the still picture file 23, with the original audio data being retained. The additional audio data are also managed by grouping in the same manner as in the still picture data and the concept thereof is the same as that of the still picture data. In other words, a plurality of additional audio data having the same attributes, e.g., audio coding attributes, are grouped into an additional audio group (to be abbreviated as "GAOB") and then additional audio group general information is recorded as common information. For the respective additional audio data AOBs, only the size information is recorded. The additional audio group general information contains the start positions of audio data in the respective additional audio groups (GAOBs). The connection information for the additional audio data added to the specific still picture, which is indicated by thick arrows in
In order to locate a recording position of a specific still picture in the still picture group, the start position of the still picture group data contained in the still picture group general information is added to the size of the data preceding the still picture to be located. Likewise, in order to search the recording position of specific additional audio data, the start position of the additional audio group data contained in the additional audio group general information is added to the size of the data preceding the additional audio data to be located.
In the case of a still picture group, video parts and audio parts are consecutively recorded in a file or space. Thus, the video information and the audio information each containing the size thereof are also recorded in the bitstream order in which the video data and the original audio data are actually recorded. In the case of an additional audio group, there is only the additional audio data. Thus, only the additional audio information is recorded in the bitstream order in which the additional audio data is actually recorded.
Thus, as shown in
During recording, an AV codec 110 compression-codes an externally applied A/V signal by a predetermined compression scheme and supplies size information for compressed data. A digital signal processor (DSP) 120 receives A/V data supplied from the AV codec 110, adds additional data for ECC (error correction code) processing thereto and performs modulation using a predetermined modulation scheme. A radio frequency amplifier (RF AMP) 130 converts electrical data supplied from the DSP 120 into an RF signal. A pickup 140 drives a disk and records the RF signal supplied from the RF AMP 130, incorporating an actuator for focusing and tracking. A servo 150 receives information necessary for servo control from a system controller 160 and stably performs a servo function. The system controller 160 controls the overall system through interfacing with a user to thus control the still picture to be recorded on the disk and record separate information for the recorded still picture. Still picture data are managed at a group level by constructing the still picture group information of the information for the respective still pictures, including size information of still picture data, size information of original audio data, playback time information of original audio data and the like, and the position information of the respective still pictures, in the recording order of recorded still pictures and audio data. When additional audio data is added to a still picture, the added additional audio data is recorded in a different file from or in the same file as that for the still picture but in a different area from that of the still picture. Additional audio data are managed at a group level by constructing additional audio group information of the information for recorded additional audio data, including size information of additional audio data, playback time information of additional audio data and the like, and position information of the respective additional audio groups. The information for the respective still pictures includes information indicative of the added additional audio data.
In the case when a user intends to delete an arbitrary still picture via a user interface, the system controller 160 does not to actually delete the still picture but sets deletion information in the still picture group information to a virtual delete state so that it is virtually deleted. In other words, since data is not reproduced during playback although it actually exists, it appears to the user that the data is deleted. In such a manner, if a specific still picture is virtually deleted and original audio data is recorded in sequence with the still picture, the original audio data is not reproduced either. Also, if additional audio data is added to the still picture, virtually deleted additional audio information in the additional audio group information is set to a virtual delete state so that although the additional audio data exists actually, it appears to the user that the additional audio data is deleted.
Cell information concerning the reproduction order is recorded as well as the above-described information. The cell information contains information indicative of the recorded still picture group so that the recorded still picture and audio data can be reproduced.
During playback, the pickup 140 picks up the optical signal from the disk having data stored therein and the data is extracted from the optical signal. The RF AMP 130 converts the optical signal (that is, RF signal) into electrical data, and extracts a servo signal for performing a servo function, and modulated data. The DSP 120 demodulates modulated data supplied from the RF AMP 130 corresponding to the modulation scheme used during modulation, performs an ECC process to correct errors and eliminates added data. The servo unit 150 receives information necessary for servo control from the RF AMP 130 and the system controller 160 and stably performs a servo function. The AV codec 110 decodes the compressed A/V data supplied from the DSP 120 to output an A/V signal. The system controller 160 controls the overall system for reproducing the user's desired data (still picture only, still picture+original audio data or still picture+additional audio data) using the cell information and still picture group information stored on the disk while performing user interfacing such as processing of the user's key inputs.
In other words, in order to reproduce a specific still picture and audio data, the still picture group information having the still picture to be reproduced is obtained from the cell information, information such as the size of the still picture data and the information for the data size and playback time of original audio data, if any, is obtained from the still picture group information, thereby reproducing only desired data. Also, if additional audio data is added to the still picture, desired additional audio data is reproduced using information for the data size or playback time of the additional audio data from the additional audio group information pointed to by the still picture group information.
Also, if virtually deleted still picture information is read from the still picture group information, the corresponding still picture and original audio data are not reproduced so that although the data actually exists, it seems to the user that it does not exist. Likewise, if the added additional audio data is virtually deleted, it is not reproduced.
Here, the A/V codec 110, the DSP 120, the RF AMP 130 and the pickup 140 operating during recording can be referred to as a recording processor. Also, the pickup 140, the RF AMP 130, the DSP 120 and the A/V codec 110 operating during playback can be referred to a reproduction processor.
Also, as information for the respective still pictures, still picture information having original audio data exists in the form of map information including video part information for video parts and audio part information for audio parts. Here, a video map and an audio map for a still picture have the same identification information. If the still picture information includes only a video part, it exists in the form of a map having only the video part information. In the still picture group information 202, virtual deletion information for virtually deleting both a still picture and original audio data added thereto is present. Here, still picture data is recorded in a VOB.
The additional audio data are stored in a separate area from the still picture data, that is, in a different file or in a different area of the same file from or as that of the still picture data.
For example, in the case when the additional audio data is stored in a separate file from the still picture data, as shown in
Alternatively, in the case when the additional audio data and the still picture data are stored in one and the same file, GVOB #1, #2 and #3 and GAOB #1, #2 and #3 shown in
In the present invention, when a plurality of still pictures are recorded in a file and still pictures are deleted and fragmented in several parts by a user's request, to avoid an abrupt increase in file extent information, a plurality of still pictures are grouped and managed at a still picture group level, and each still picture has virtual deletion information. Thus, even if a user deletes a still picture, the still picture is not actually deleted from the file but appears to be deleted since they are not reproduced according to the virtual deletion information. In some cases, the user deletes still pictures for the purpose of securing empty space (free area) for recording new data thereon in addition to avoidance of reproduction of data. In this case, since the data is not actually deleted, the empty space cannot be secured just by using the virtual deletion information. If all of the still pictures in the still picture group information are virtually deleted, they are actually deleted from the file in units of still picture groups, thereby securing a free area. In other words, since a still picture group is formed by a plurality of still pictures, a considerable amount of free space is produced by deleting the same.
As shown in
However, if additional audio data is added to a still picture, instead of the virtual deletion information (which can be referred to as first virtual deletion information) for a still picture, as shown in
Actual deletion of a file occurring in a still picture group or additional audio group will be described with reference to
As shown in
Similarly, data of an additional audio group file can be actually deleted. As shown in
The information for the additional audio group #3 in the additional audio group information 332 is deleted and updated additional audio group information 333 is created. Data for GAOB #3 in an actual audio file 334 is deleted to be allocated as a free area. In this case, the file extent information is increased by a very small amount. In
Also, the video map contains V_DELETE which is a binary value indicating deletion or non-deletion of a VOB, that is, indicating that a VOB is not deleted if the value thereof is "0" and that the VOB is virtually deleted if the value thereof is "1", V_PART_SZ indicating the size of a video part, GAOB_ID which is identification information of an additional audio group, the value of which exists if a still picture has additional audio data, and the value of which is "0" if a still picture does not have additional audio data, and AOB_ID which is identification information of additional audio data in an additional audio group if a still picture has additional audio data, and the value of which is "0" if the still picture does not have the additional audio data.
Here, V_DELETE represented by a binary value "1" indicates that a still picture is virtually deleted. Thus, if the still picture has original audio data, the original audio data is also considered to have been virtually deleted. This is because original audio data solely existing after the still picture is deleted as being meaningless. Also, VOB_ID and V_PART_SZ can be referred to as still picture position information, and GAOB_ID and AOB_ID can be referred to as additional audio connectivity information.
It is determined whether or not a mode set by a user is for recording both a still picture and original audio data (step S105). If yes, the audio data for the still picture is recorded following the corresponding still picture on the still picture file and the audio size information is recorded in an audio map in the still picture group information (step S106).
It is determined whether the number of still pictures recorded is the maximum number possible to constitute the information for a still picture group (e.g., 64 maximally) (step S107). If the still picture group information is completed, the procedure returns to step S102 to generate another still picture group information. Otherwise, the procedure proceeds to step S103 to determine whether a recording start signal of a still picture is input by a user or not.
If the mode set by a user is for recording only a still picture in step S105, step S106 is skipped and the procedure proceeds to step 107 to record the next still picture. If the recording start signal of a still picture is not input by a user in step S103, it is determined whether or not to terminate recording (step S108). If it is determined to terminate recording, cell information is recorded and the procedure ends (step S109). Here, the cell information is created for every still picture group so as for all still pictures to be reproduced.
It is then determined whether the recording start signal of additional audio data is input by a user or not (step S202). If the recording start signal is input, a specific still picture to which the user desires to add additional audio data is designated (step S203). The additional audio data is recorded in an additional audio file, identification information for additional audio data in the audio map of the additional audio group information is allocated, the number of additional audio parts in the additional audio group is increased by one, and the size information of the additional audio data in the audio map is recorded (step S204). Although it has been described herein that the additional audio data is recorded in a different file from that of the still picture, the additional audio data can be recorded in a separate area of the same file as that of the still picture.
Identification information for the still picture group of a predetermined still picture and identification information for the still picture are read and the information for the still picture, that is, identification information for an additional audio group for additional audio parts and identification information for additional audio data, are recorded in the video map for the predetermined still picture (step S205).
It is then determined whether the number of additional audio parts in an additional audio group reaches N, that is, a maximum number to constitute a group (step S206). If yes, the procedure goes to step S201 to generate another additional audio group information. Otherwise, it is determined whether the recording start signal of additional audio data is input by a user (step S202). If a recording start signal of additional audio data is not input by a user in step 202, the procedure is terminated.
Here, the step of designating a specific still picture (step S203) may precede the step of determining whether or not a recording start signal of additional audio data is input by a user (step S202).
The position of a desired still picture is calculated by the read video part information and video data located at the calculated position is read and decoded to reproduce the still picture (step S304). Here, the position of a desired still picture is obtained by summing the start position of a still picture group and the size of data preceding the desired still picture. While the still picture is reproduced, it is determined whether original audio data is added to the still picture (step S305). If yes, the original audio data is read and decoded to reproduce the original audio data (step S306). Here, the reading position of the original audio data is obtained by summing the calculated position of the still picture and the size of a video part of the desired still picture. It is checked whether all still pictures belonging to a cell are reproduced or not using the cell information and then it is determined whether or not there is a still picture to be reproduced next (step S307). If yes, the information for the video part of the still picture to be reproduced next is read (step S303). Otherwise, the procedure is terminated. In the case when there are a plurality of series of cell information, this routine is repeated.
Here, the step of determining whether original audio data is added to a still picture (step S305) may be performed directly after the step of reading the still picture group information (step S302). This is because it is possible to determine that original audio data is added to a still picture in the case when an audio map for an audio part is added subsequently to a video map for a video part, in accordance with the still picture group information.
It is then checked whether additional audio data is present in the still picture group information or not (step S405). If not, it is checked whether there is original audio data (step S406). Here, the presence of additional audio data in the map information for the video part of the desired still picture to be reproduced can be determined using the identification information for an additional audio group and the identification information for additional audio data. The presence of original audio data can be known by determining whether there is audio information (an audio map) in the map table of the desired still picture to be reproduced.
If there is original audio data in step S406, the read position of the original audio data is calculated (step S407). Here, the read position of the original audio data is obtained by summing the calculated position of the desired still picture and the size of the video part of the desired still picture. Original audio data is read from the calculated position information of the desired still picture and decoded to reproduce the original audio data (step S408) and the procedure proceeds to step S411 as shown in FIG. 28B.
If additional audio data is present in step S405, that is, if the read identification information for the additional audio group designated to the still picture and identification information for the additional audio data are not "0", the start position of the additional audio group is read from the additional audio group information to calculate the position of desired additional audio data (step S409 in FIG. 28B). The position of desired additional audio data is obtained by summing the start position of an additional audio group and the size of the additional audio data preceding the additional audio data having the identification information for the desired additional audio data in the additional audio group.
Additional audio data is read from the calculated position information for the desired additional audio data and is decoded to reproduce the additional audio data (step S410). Then, it is determined whether there is a still picture to be reproduced next (step S411). If yes, the procedure returns to step S403. Otherwise, the procedure is terminated (step S411). In the case of reproducing a plurality of cells, the overall procedure is repeated.
Alternatively, instead of step 405 of determining whether additional audio data is present or not and step 406 of determining whether original audio data is present or not, it is first determined using the still picture group information read in step S402 whether the still picture to be reproduced is a still picture having only a video part, one having original audio data added thereto, or one having additional audio data added thereto. If the still picture has only a video part, steps S403 and S404 are performed. If the still picture has original audio data, steps S403, S404, S407 and S408 are performed. If the still picture has additional audio data, steps S403, S404, S409, S410 and S411 are performed.
Further, according to another aspect of the present invention, before reproduction, a reproduction mode is set by interfacing with a user to determine whether only a still picture is to be reproduced, both a still picture and original audio data are to be reproduced, or both a still picture and additional audio data are to be reproduced.
When it is determined that the virtual deletion information is set to a virtual delete state, the still picture set to the virtual delete state should not be reproduced. Thus, reproduction is skipped and the procedure proceeds to step S508.
If the virtual deletion information is not set to a virtual delete state in step S504, the position of a desired still picture is calculated by the read video part information and video data located at the calculated position is read and decoded to reproduce the still picture (step S505). Here, the position of the desired still picture is obtained by summing the start position of the still picture group which includes the desired still picture and the size of data preceding the desired still picture. While the still picture is reproduced, it is determined whether audio data is added to the still picture (step S506). If yes, the audio data is read and decoded to reproduce the audio data (step S507). Here, two types of audio data are added to a still picture, that is, original audio data recorded with video data of the still picture and additional audio data added after recording. Either type or both types of audio data may exist. If both types of audio data exist, the additional audio data is automatically reproduced or one type of audio data is selected by a user to then be reproduced.
Here, the read position of the original audio data is obtained by summing the calculated position of the still picture and the size of a video part of the desired still picture. The position of the additional audio data is obtained by summing the start position of the additional audio group indicated by the still picture group information and the size of additional audio data preceding additional audio data having identification information for the additional audio data in the additional audio group information.
It is checked whether all still pictures belonging to a cell have been reproduced or not using the cell information and then it is determined whether or not there is a still picture to be reproduced next (step S508). If yes, the information for the video part of a still picture to be reproduced next is read (step S503). Otherwise, the procedure is terminated. In the case of reproducing a plurality of cells, the overall procedure is repeated.
It is determined whether the virtually deleted still picture has additional audio data (step S606). If yes, virtual deletion information for additional audio data in the corresponding additional audio group information is set to a virtual delete state "1" (step S607). It is determined whether virtual deletion information for all additional audio parts in the corresponding additional audio group information is set to a virtual delete state "1" (step S608). If virtual deletion information for all additional audio parts in the corresponding additional audio group information is set to a virtual delete state "1", the corresponding additional audio group is actually deleted from the additional audio information and the additional audio group information is updated (step S609). All of the data in the corresponding additional audio group is actually deleted from an additional audio data file (step S610).
As described above, according to the present invention, during reproduction, a virtually deleted still picture is not reproduced, using virtual deletion information. Thus, recording areas can be prevented from being scattered when some data files are deleted at a user's request, thereby avoiding an abrupt increase in file extent information.
Also, original audio data added to a virtually deleted still picture can be virtually deleted using virtual deletion information, and additional audio data corresponding to the still picture can also be virtually deleted. A still picture or additional audio data virtually deleted in units of groups is actually deleted from a file so that a free area for recording new data can be secured.
Further, a large number of still pictures, original audio data added thereto and additional audio data can be recorded using a minimum amount of information. During reproduction, data can be displayed and edited in units of still pictures. Also, it is possible to confront after-recording of audio data using the additional audio data. Video maps and/or audio maps for still pictures can be formed in a recording order of bitstreams, thereby allowing effective management of information.
Oh, Young-Nam, Moon, Seong-jin, Chung, Tae-yun, Kang, Jung-suk, Park, Pan-gie
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